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Dengue spreads from one person to another mainly through
A housefly sits on garbage and then on uncovered sweets in a shop. In spreading disease, the housefly acts as a
Assertion (A): Cases of malaria usually rise during and just after the rainy season. Reason (R): Malaria is caused by a protozoan called Plasmodium.
After the monsoon, many families in a housing colony fell ill with dengue, though the colony's tap water was clean. Residents found water collected in old tyres, flower-pot trays and air coolers. Explain why dengue spread, and suggest three steps residents and the municipality should take.
A town health centre recorded the number of dengue cases from April to September. The data is shown in the bar graph. The monsoon in this town lasts from mid-June to mid-September.
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